problem with gallery

Hi,
I bought the pro version, but it seems that it interferes with my wordpress theme. When I add more than three images in a product, the gallery doesn’t work, nor the next-prev arrows, nor images in the thumbnails.
How can this be possible?
When I try the free version with the same wordpress theme, I didn’t have this problem and the gallery (with three images) perfectly works.

https://wordpress.org/plugins/wp-catalogue/